Apparatus for moving a tone arm

ABSTRACT

In a record player, the movement of the tone arm is controlled by a select plate operated by a lever which moves the plate to a position corresponding to a record size. Adjacent the select plate is a C-shaped lever which cooperates with a rotary member. The rotary member has a plurality of cams which serve to program the operation and various movements of the tone arm. Extending from the peripheral edge of one of said cams is a brush. The tone arm is also responsive to a bracket with a wall, said wall being engaged by the brush. A position detector plate is mounted on the bracket which cooperates with a photo-interrupter to detect the position of the tone arm with respect to a record being played.

DESCRIPTION

1. Technical Field

This invention relates to an apparatus for moving a tone arm in a recordplayer.

2. Background Art

From the viewpoint of their drive systems, apparatus for moving a tonearm can be broadly classified into the turntable drive system whichutilizes the driving force of a turntable and the exclusive motor drivesystem which employs the driving force of a driving motor for exclusiveuse in addition to the driving force of a turntable. The former requiresdriving-force transmission means for transmitting the drive force of theturntable to a tone arm shaft as desired, and becomes very complicatedstructurally. As regards the latter, granted that the driving force ofthe exclusive motor is similarly transmitted to a tone arm shaft, theexclusive motor can be disposed in proximity to the tone arm shaft,which brings forth the advantage that a structure simpler than thestructure of the turntable drive system is permitted. Since, however,the driving motor is expensive, the latter has the disadvantage that thefabrication cost as the whole system is high.

On the other hand, in recent years, the apparatus for moving the tonearm is usually constructed so that the lead-in operation of the tone armcan be made also manually in order to select an arbitrary piece of musicmidway on a disk and play it.

OBJECTS OF THE INVENTION

The principal object of this invention is to provide an apparatus formoving a tone arm in a record player that employs the exclusive motordrive system as its drive system for the tone arm, the apparatus havingits structure simplified to the utmost and reducing to the utmost theincrease of its cost due to the cost of a driving motor.

Another object of this invention is to provide an apparatus for moving atone arm in a record player to make it possible to play a record througheither an automatic or a manual operation for the tone arm.

Still another object of this invention is to provide an apparatus formoving a tone arm in a record player which can stabilize theauto-lead-in operation and auto-return operation of the tone arm.

Further objects, features and advantages of this invention will becomeapparent from the following detailed description and the accompanyingdrawings in which:

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a plan view of a record player to which this invention isapplied.

FIG. 2 is a bottom view of an apparatus for moving a tone arm accordingto this invention.

FIG. 3 is a partial side view of the apparatus.

FIG. 4 is a perspective view of a rotary member seen obliquely fromabove.

FIG. 5 is a perspective view of the rotary member seen obliquely frombelow.

FIG. 6 is a partial bottom view of the apparatus immediately before theend of an auto-lead-in operation.

FIG. 7 is a partial bottom view of the apparatus at the end of play.

FIG. 8 is a partial bottom view showing a case where the tone arm hasbeen led in by a manual operation.

FIG. 9 is a bottom view showing another aspect of performance of aselect plate.

FIG. 10 is a side view of the select plate.

FIG. 11 is a side view of the select plate showing an operatingrelationship thereof.

FIG. 12 is a partial plan view showing still another aspect ofperformance of the select plate.

DETAILED DESCRIPTION

Referring to FIGS. 1 to 5, numeral 1 designates a cabinet of a recordplayer, numeral 2 a turntable which is driven by a known direct drivesystem or indirect drive system, numeral 3 a tone arm which is mountedon the cabinet 1 in a manner to freely move about in the verticaldirection and the horizontal direction, numeral 4 an arm rest for thetone arm 3, numeral 5 an arm lifter which moves the tone arm 3 in thevertical direction, numeral 6 a select lever for a record size, numeral7 a start switch of an automatic performance apparatus for the tone armaccording to this invention, numeral 8 a cut switch of the apparatus,and numeral 9 a first repeat switch of the apparatus.

A chassis A is mounted on the inner bottom part of the cabinet 1. Theessential portions of the automatic performance apparatus according tothis invention are installed on the chassis A.

In substantially the central part of the chassis A, a rotary member 13which is deceleratedly rotated through a first intermediate gear 11 anda second intermediate gear 12 by means of a driving motor 10 issupported by a shaft. As specifically shown in FIGS. 4 and 5, the rotarymember 13 is provided with a gear 14 in its outer periphery. Acircumferential cam 15 and a horizontal cam 16, and a circumferentialcam 17 and a circumferential cam 18 are superposedly provided on theupper side and the lower side of the rotary member 13, respectively. Abrush 19 is suspended from an outer peripheral edge part of thecircumferential cam 18.

The horizontal cam 16 disposed on the upper side of the rotary member 13is such that an endless cam plate 20 provided with a recess in anintermediate part is snugly secured to the rotary member 13.Protuberances 20a, 20a which protrudes from the peripheral part of thecam plate 20 can be successively fitted into a plurality of notches 13a,13a . . . provided on the upper side of the rotary member 13, wherebythe position of the recess can be adjusted.

A control lever 21 which is supported by an arbor 12a of the secondintermediate gear 12 and which presents substantially a C-shape in planview opposes a pressure receiving projection 21a provided at a web partthereof, to the circumferential cam 15 of the rotary member 13constructed as described above. The bottom part of an elevation rod 5aof the arm lifter 5 abuts on the horizontal cam 16. One side end of abrake lever 22 whose turning is urged in one direction by a spring 34abuts on a first convex part 17a of the circumferential cam 17. Acontact actuating lever 23a of a switch 23 which is releasing switchmeans for the driving motor 10 falls in a first concave part 18a of thecircumferential cam 18, to turn the switch "off".

The control lever 21 has its turning urged counterclockwise by a coiledtension spring 24 extended between it and the chassis A. One side end ofthe control lever 21 beyond a fulcrum thereof is provided with anengaging piece 21b, the other side end is provided with a switchpressing piece 21c, and the other side end is further provided with apressing pin 21d. The side on which the engaging piece 21b is disposedopposes a select plate 25 pivotally mounted on the chassis A, the switchpressing piece 21c opposes to a switch 26 of a motor (not shown) fordriving the turntable 2, and the pressing pin 21d opposes to andcontacts with a brake drum 27 which is mounted on a tone arm shaft 3a.

The select plate 25 is turned through a coupling rod 28 by the selectlever 6 which is disposed on the cabinet 1 so as to protrude, andalternately brings pressure receiving stoppers 25a and 25b, disposed onthe lower side so as to protrude in opposition to the control lever 21.A bracket 29 which is provided with a vertical wall 29a and an actuatingprojecting piece 29b is further mounted on the lowermost part of thetone arm shaft 3a. The bracket 29 overlaps the lower surface of therotary member 13. A position detector plate 30 for the tone arm 3 as isprovided with a plurality of apertures 30a, . . . is mounted on thefront end of the bracket. One end of the position detector plate isfitted in a photo-interrupter 31. On the side of the brake lever 22close to the brake drum 27, a brake shoe 22a is mounted. A second repeatswitch 32 for repeat performance is disposed in opposition to the rearof the brake shoe 22a. On the side of the brake lever close to therotary member 13, an engaging projective piece 22b is disposed.

A manual lever 33 is supported by a shaft between the brake lever 22 andthe control lever 21. On the side of the manual lever 33 close to thecontrol lever 21, an engaging projection piece 33a is provided, and onthe side thereof close to the brake lever 22, an engaging projection 33bwhich is selectively brought into engagement relationship with theengaging projective piece 22b provided in the brake lever 22 isprovided. In the position of the manual lever 33 opposing to theactuating projective piece 29b of the bracket 29, a magnet 33c inmagnetic attraction relationship with the piece 29b is mounted.

OPERATION OF THE INVENTION

Now, there will be described a case where the automatic performance of adisk having a diameter of 30 cm takes place under the conditionsdescribed. When the select lever 6 is first turned to a positionindicated as 30 cm, the select plate 25 turns through the coupling rod28 to oppose the pressure receiving stopper 25a onto the side of thecontrol lever 21. When the start switch 7 which is a first-period startswitch for the driving motor 10 is pressed, the driving motor 10 startsrotating, the driving force thereof is transmitted to the rotary member13 through the first and second intermediate gears 11 and 12, and therotary member 13 begins to rotate counterclockwise. Then, the contactactuating lever 23a of the switch 23 comes out of the first concave part18a of the circumferential cam 18. Simultaneously therewith, the frontend of the brake lever 22 is released from the first convex part 17a ofthe circumferential cam 17 and turns clockwise under the action of thespring 34 to bring the brake shoe 22a into contact with the brake drum27. The rotary member 13 further rotates, and its circumferential cam 15gradually releases the pressing action on the pressure receivingprojection 21a of the control lever 21. Therefore, the control lever 21urged to turn counterclockwise by the coiled tension spring 24 turnscounterclockwise until one side thereof abuts on the pressure receivingstopper 25a. Thus, the pressing pin 21d pushes one side of the brakedrum 27 with the brake function operating, moves the tone arm 3 alongwith the bracket 29 towards the disk in an exact and stable motion andguides a record stylus, mounted on the front end of the tone arm, overthe lead-in groove of the disk 30 cm in diameter. Simultaneously, theswitch pressing piece 21c of the control lever comes away from thecontact of the switch 26 of the turntable driving motor (not shown) andturns it "on", so that the turntable 2 begins to rotate. These statesare illustrated in FIG. 6. At this time, the manual lever 33 which holdsthe magnet 33c mounted at one end thereof in contact with the actuatingprojective piece 29b of the bracket 29 intends to rotate together.Since, however, the engaging projective piece 22b provided in the brakelever 22 engages the engaging projection 33b provided in the manuallever 33 and prevents the turning of the manual lever, the manual lever33 cannot rotate in this case. The stop state of the tone arm 3 over thelead-in groove of the disk is stabilized by the brake action of thecontact between the brake shoe 22a provided in the brake lever 22 andthe brake drum 27 fastened to the tone arm 3. This prevents the tone arm3 from coming back lightly after having been guided over the lead-ingroove, or from being fed excessively.

Subsequently, the rotary member 13 rotates further. A second convex part17b of the circumferential cam 17 pushes and rotates the brake lever 22again, to separate the brake shoe 22a from the brake drum 27. About thattime, the elevation rod 5a of the arm lifter 5 falls into the recess ofthe horizontal cam 16 provided on the rotary member 13, to lower thefront end of the tone arm 3 and to bring down the record stylus onto thelead-in groove quietly. Simultaneously, the contact actuating lever 23aof the switch 23 falls into a second concave part 18b of thecircumferential cam 18, to open the starting circuit of the drivingmotor 10 and to stop the motor. Therefore, also the rotary member 13stops in a position where it has rotated 180°. In this regard, thelead-in operation for the tone arm 3 may of course be ended at an angleof rotation different from 180° so as to stop the rotary member 13thereat.

In this manner, the record performance becomes possible. When theperformance has ended and the record stylus has begun to move in alead-out groove of greater pitch, the photo-interrupter 31 and theposition detector plate 30 detect the position of the stylus and sensethe end of the record performance as illustrated in FIG. 7. Thus, thestarting circuit of the driving motor 10 is closed again vialatter-period switch means of a known construction. Therefore, therotary member 13 starts rotating. The brake lever 22 released from thepressing action of the second convex part 17b of the circumferential cam17 causes the brake shoe 22a to abut on the brake drum 27 again. Whilecausing the contact actuating lever 23a of the switch 23 to get out ofthe second concave part 18b of the circumferential cam 18, the brakelever causes the elevation rod 5a of the arm lifter 5 to get out of aconcave part 16a of the horizontal cam 16, and it lifts up the front endof the tone arm 3 through the elevation rod. Thereafter, the brush 18pushes the vertical wall 29a provided in the bracket 29 and turns itclockwise along with the tone arm 3, to return the tone arm 3 onto thearm rest 4. Almost simultaneously with this operation, thecircumferential cam 15 turns the control lever 21 counterclockwise tothe original position against the tractive force of the coiled tensionspring 24. The switch pressing piece 21c presses the contact of theswitch 26 of the motor (not shown) for driving the turntable 2 and turnsthe motor "off" to stop the turntable 2. Subsequently, the brake lever22 is pressed and turned by the first convex part 17a of thecircumferential cam 17 again. When the brake shoe 22a of the brake leverhas come away from the brake drum 27, the contact actuating lever 23a ofthe switch 23 falls into the first concave part 18a of thecircumferential cam 18 to open the starting circuit of the driving motor10 and to stop the rotary member 13 again. In this state, the automaticperformance apparatus is reset so that the tone arm 3 can again besubjected to the auto-lead-in by the next rotation.

Supposing that the first repeat switch 9 protrusively disposed on thecabinet 1 is kept "on" at this time, when the brake lever 22 is pressedand turned by the first convex part 17a of the circumferential cam 17,the rear part of the brake shoe 22a turns "on" the second repeat switch32. Therefore, the performance is repeatedly made.

In the next place, in case where a disk having a diameter of 17 cm is tobe automatically performed, the select lever 6 is turned to a positionindicated as 17 cm. Then, the select plate 25 turns through the couplingrod 28 and opposes the pressure receiving stopper 25b to the controllever 21. in consequence, the feed-in width of the control lever 21 atthe lead-in becomes greater than in the foregoing. Under this condition,the tone arm 3 is moved over the lead-in groove of the disk 17 cm indiameter. Subsequent operations are the same as in the case of the disk30 cm in diameter.

Now, in case where the performance is to be ended in the course of therecord play, the cut switch 8 protrusively disposed on the cabinet 1 ispressed. Then, the driving motor 10 is rotated, and an auto-returnoperation which is not based on the photo-interrupter 31 and theposition detector plate 30 is made. By operations as stated above, thetone arm 3 is returned to the arm rest 4 and the automatic performanceapparatus is set towards the next auto-lead-in operation.

In this manner, the automatic performance apparatus according to thisinvention can execute the auto-lead-in operation of the tone arm 3 evenwhen the position regulating lever which is controlled by the rotarymember is excluded. Moreover, the tone arm 3 is moved in the state inwhich the brake function is operating, both during the auto-lead-inoperation and during the auto-return operation. Therefore, theinstabilities of operations during the movement of, and at the end ofthe operation of, the tone arm 3 and fluctuations such as return-backcan be perfectly checked.

In the next place, in case where the tone arm 3 is to be led in by themanual operation, the tone arm 3 is moved to a desired position on adisk by carrying it by hand irrespective of the position of the selectlever 6 as illustrated in FIG. 8. (Even at this time, the arm lifter 5keeps the front end of the tone arm 3 lifted, and hence, the recordstylus does not fall onto a record groove.) Then, the manual lever 33held in magnetic attraction with the actuating protrusive piece 29bprovided in the bracket 29 moving together does not have its movementregulated by the engaging protrusive piece 22b of the brake lever 22which is now in the stop state yet. Therefore, the manual lever 33 turnsuntil it has its movement checked by a stopper (not shown) of its own,and it moves to a position where its engaging protrusive piece 33a canengage the engaging piece 21b of the control lever 21.

When the start switch 7 is turned "on" then, the rotary member 13 turnsin order to effect the lead-in operation of the tone arm 3 and theapparatus is actuated as stated above. Since the engaging piece 21b isheld in engagement with the engaging protrusive piece 33a of the manuallever 33, the control lever 21 turns to the extent of turning "on" theswitch 26 of the driving motor for the turntable 2 and thereafter hasits movement checked. Accordingly, the rotary member 13 turns withoutthe feed-in of the tone arm 3 by the control lever 21. It stops afterhaving quietly lowered the front end of the tone arm 3 onto the disk asdescribed before, and the apparatus is set for the next auto-returnoperation.

Subsequently, when the auto-return operation has been made under thisstate, the actuating projective piece 29b of the bracket 29 comes intocontact with the magnet 33c of the manual lever 33 and pushes it, sothat the manual lever 33 returns to the original position. In casewhere, in the next record performance, the auto-lead-in operation hasbeen selected, the manual lever 33 has its turning checked by theengaging protrusive piece 22b of the brake lever 22 and does not checkthe movement of the control lever 21. Alternatively, in case where themanual operation has been selected again, the above operations arerepeated.

In this way, in case where it is intended to manually bring the tone arminto the lead-in operation, the operations required therefor areautomatically made merely by carrying the tone arm to a desired positionon the disk by hand. In addition, the apparatus is thereby set for thenext auto-return operation.

FIGS. 9 to 11 show another aspect of performance of the select plate.Referring to the drawings, a select plate 35 which is protrusivelyprovided with shorter and longer pressure-receiving stoppers 35a and 35bon a side end part of the control lever 21 is attached to a supportingmember 36, disposed to be protrusive from the chassis A, in a manner tovertically rock relative to the chassis A. The movement of the selectplate is controlled by a control pin 37 projected from the chassis A.The select plate 35 has its one end urged in a direction away from thechassis A by a coiled compression spring 38 which is elasticallydisposed between the select plate and the chassis A while being woundround the control pin 37. Further, an electromagnet 39 fastened to thechassis A is disposed between the select plate and the chassis A.

Accordingly, when a select switch, not shown, disposed on the cabinet 1is not turned "on", the electromagnet 39 is not energized and the coiledcompression spring 38 pushes the select plate 35 in the direction awayfrom the chassis A as illustrated in FIG. 10. Therefore, the positionsof the stoppers are controlled by the spring, and the control lever 21abuts on the shorter pressure-receiving stopper 35a during the lead-inof the tone arm 3. In contrast, when the select switch is turned "on",the electromagnet 39 is energized, and the select plate 35 rocks againstthe elastic force of the coiled compression spring 38 to lower the sideon which the pressure receiving stoppers 35a and 35b are disposed. Asshown in FIG. 11, therefore, the longer pressure-receiving stopper 35babuts on the control lever 21 now. In this way, the oscillating width ofthe control lever 21 changes, and the lead-in operations of the tone arm3 for disks of unequal diameters can be made.

When the select switch is turned "off" to deenergize the electromagnet39, the select plate 35 is returned to the original position by theelastic force of the coiled compression spring 38.

FIG. 12 shows still another aspect of performance of the select plate. Aselect plate 40 which is protrusively provided with pressure receivingstoppers 40a and 40b on the side of the control lever 21 is supported bya shaft in a manner to horizontally turn relative to the chassis A. Oneof its sides is urged so as to turn clockwise by extending a coiledtension spring 41 between it and the chassis A, while an energizing rod43 of a solenoid 42 secured to the chassis A is coupled to its otherside.

Accordingly, unless a select switch not shown is turned "on", onepressure-receiving stopper 40a abuts on the control lever 21 during thelead-in operation. When the select switch is turned "on", the solenoid42 is energized, and hence, the select plate 40 turns counterclockwiseagainst the tractive force of the coiled tension spring 41, so that theother pressure-receiving stopper 40b abuts on the control lever 21during the lead-in operation. In this way, the auto-lead-in for disks ofunequal diameters becomes possible.

When the solenoid 42 is deenergized, the select plate 40 is movedbackwards till the abutment on a stopper 44 and returned to the originalposition by the tractive force of the coiled tension spring 41.

As described above in detail, the tone arm-moving apparatus of theexclusive motor drive system according to this invention can effect theauto-lead-in operation and the auto-return operation of the tone armwhile the rotary member rotates one revolution, by the use of thecomparatively simple construction. Besides, the manual operation of thetone arm is permitted. Further, the auto-lead-in and the auto-return ofstable operations can be effected.

What is claimed is:
 1. In a record player having a tone arm rest (4), anarrangement for moving a tone arm (3) out of and back into said tone armrest (4), said arrangement comprising in combination:(a) a chassis plate(A); (b) a rotary member (13) with an upper and a lower side, saidrotary member being disposed on said plate (A) substantially at thecenter part thereof, said rotary member (13) including: notches (13a) onthe upper side thereof, gear teeth (14) on its outer periphery, acircumferential first cam (15) whose thickness varies along its edges,said circumferential first cam (15) being at the top of said rotarymember, a horizontal second cam (16) disposed on the upper side of saidrotary member (13), said horizontal second cam (16) having an endlesscam plate (20) with a concave recess at its intermediate part, also,protuberances (20a) which extend from the peripheral part of the camplate (20) which fit into the notches (13a) so that the relativeposition of the cam plate (20) on the rotary member (13) can beadjusted, a brake control circumferential third cam (17) on the lowerside of said rotary member (13) with first and second convex parts (17a,17b), a switch actuating circumferential fourth cam (18) with first andsecond concave parts (18a, 18b) also on said lower side, said third andfourth cams being superposed on said rotary member (13), a brush (19)extending from the outer peripheral edge of said switch activatingfourth cam (18), gear drive means including a drive motor (10), a drivegear (12) engaging said gear teeth, and, an arbor pin (12a) at thecenter of said drive gear (12); (c) a C-shaped control lever (21) with apressure receiving projection (21a), responsive to said circumferentialfirst cam (15), said C-shaped lever having a switch pressing side piece(21c), and one and the other ends, said one end having an engaging piece(21b), said other end having a pressing pin (21d), said control leverbeing disposed for pivotal movement on said arbor pin (12a) so as toswing about said rotary member (13), control lever spring means (24) inthe vicinity of said engaging piece (21b) and outward of said C-shapedcontrol lever, biasing said control lever for rotation about said arborpin (12a) in a rotary direction so that said engaging piece (21b) tendsto move toward said spring means (24); (d) a hollow cylindrical tone armlifter (5) with an elevation rod (5a) extending through the hollow partof said tone arm lifter, said elevation rod (5a) having a bottom partdisposed to engage said concave recess of the horizontal second cam(16), and a tone arm (3) operatively engaged by said tone arm lifter(5a); (e) a select plate (25) with a defined apex pivoted at said apexto said chassis plate (A), select lever means (28, 6) for selecting afirst and a second record disc size lead-in position, said select levermeans (28, 6) serving to control the movement of the tone arm, saidselect lever means being coupled to said select plate (25), said selectplate having first and second stoppers (25a, 25b), for said first andsecond record disc sizes, said stoppers being so disposed on said selectplate on the side of said select plate opposite said defined apex so asto contact said control lever engaging piece; (f) a bracket (29)disposed to overlap said rotary member (13), a vertical wall (29a)disposed to be engaged by said brush (19) said vertical wall (29a)extending in the direction of said brush on said bracket (29), anelongated position detector plate (30) mounted on said bracket (29),said position detector plate having a plurality of spaced apertures(30a), a brake drum (27) fastened to said tone arm (3) and disposed forengagement by said contact lever pressing pin (21b), a photointerrupter(31), disposed to engage said elongated position detector plate (30) anddetect each of said spaced apertures; and, (g) brake lever means (22)having an arm with a brake shoe (22a) on one side of said C-shapedcontrol lever (21) opposed to said brake drum (27), said brake levermeans (22) being held on said plate (A) close to said rotary member(13), said brake lever means having an end disposed to be in contactwith said convex parts (17a, 17b), a brake spring (34) biasing saidbrake drum (27), an engaging surface (22b) on said brake lever means(22), a turntable switch (26) on the other side of said C-shaped controllever (21), responsive to said switch pressing side piece (21c), a firstperiod start manual switch (7), operatively coupled for starting thedrive means, and, a second switch (23) adjacent said rotary member (13)with an actuating lever (23a) extending to the circumference of saidcircumferential fourth cam (18); whereby, in a first operational phase,when said select lever means (6, 28) is first moved to a position forone of said record sizes, said select plate (25) turns to dispose theproper stopper (25a) corresponding to said selected size, opposite saidengaging piece (21b), when the first switch (7) is pressed, the drivemotor (10) rotates and said rotary member (13) is driven, contactactuating lever (23a) comes out of said first concave part (18a), thecontact end of the brake lever means (22) is released from the firstconvex part (17a) and turns under the action of said brake spring (34)to bring the brake shoe (22a) into contact with the brake drum (27), therotary member (13) further rotating, releasing the pressure of saidcircumferential first cam (15) on said receiving projection (21a) sothat said control lever turns by the action of said control lever springmeans (24) until one side of said lever abuts against said pressurereceiving stopper (25a), thus, the pressing pin (21d) pushes one side ofthe brake drum (27), the tone arm (3) along with the bracket (29) movestoward the position of a record disc of said selected record size,simultaneously, switch pressing side piece (21c) releases said turntableswitch (26) turning it on, but the tone arm remains over the lead-inposition because of the contact between the brake shoe (22a) and thebrake drum (27), as the rotary member (13) rotates further, said secondconvex part (17b) pushes the brake lever (22) to separate the brake shoe(22a) from the brake drum (27), the elevation rod (5a) falls into therecess of the horizontal second cam (16) to bring the tone arm down,also contact actuating lever (23a) falls into said second concave part(18b) to start the drive motor (10) while the rotary member (13) stopsafter having turned a predetermined angle, then, in a second operationalphase, when the record playing is finished, the photo interrupter (31)and the position detection plate (30) detect the position of the tonearm, the rotary member (13) starts rotating, the brake lever (22) isreleased from the pressing action of said second convex part (17b), thebrake shoe (22a) engages the brake drum (27), while the contactactuating lever (23a) gets out of second concave part (18b), the brakelever means causes the elevation rod (5a) to get out of said concaverecess so as to lift up the tone arm (3), the brush (19) pushes thevertical wall (29a) and turns it to return the tone arm to said tone armrest (4), also, the circumferential first cam (15) turns the controllever to its original position against the force of said control leverspring means (24) the switch pressing piece (21c) presses the turntableswitch (26) to the OFF position, the brake lever (22) is turned by thefirst convex part (17a) and when the brake shoe (22a) has come away fromthe brake drum (27) the contact actuating lever (23a) falls into saidfirst concave part (18a) to open the circuit of said drive motor (10) tostop said rotary member (13).